Seismic Behavior of Asymmetric Building under Pushover Analysis

Pushover analysis is a tool to study the inelastic behavior of structures under strong seismic action. The 3D-pushover analysis was performed to analyze the inelastic lateral-torsional coupled response of multistory asymmetric structures. The symmetric frame and frame-wall systems were studied in this paper, and the capability curve of the top displacement and base shear,the story drift and the position of rotation center were compared with reference to corresponding symmetric structures. The characters of inelastic response of multistory asymmetric structures were found. The conclusion provides reference for performance-based seismic design of asymmetric structures.     

小麦花培材料的筛选和利用

花培育种是一条快速有效的育种途径，采用两种培养基对20个小麦组合材料进行花培分析，结果表明：小麦花培愈伤组织诱导培养基K优于C17，绿苗产率是C17的3.5倍多。不同基因型材料花药培养差异较大，筛选出一批不同类型的高培养力基因型材料，为有目的组配杂交组合提供依据，提高花培育种效率。     

摆动活齿传动系统扭转振动分析

建立了摆动活齿传动系统的扭转振动动力学模型，导出了该扭振系统的振动方程。系统动力学模型考虑了活齿传动双排结构中激波器、活齿、活齿架的转动惯量、时变啮合刚度、误差、阻尼等，因此，所建立的微分方程式是多自由度时变方程组，对此，采用四阶Runge-Kutta法对系统动态响应进行了求解。     

含间隙内燃机曲柄滑声机构动力学研究

考虑到含间隙运动副副元素的碰撞接触时的边界条件，采用非线性弹簧力和非线性阻尼描述副无素的碰撞接触过程，以此为基础建立了含间隙内燃机曲柄滑块机构的动力学模型；通过数值仿真研究了运动副间隙对机构动态特性的影响，并指出在机构高运转条件下，运动副元素存在连续变形接触现象。     

添加纳米粒子的塑料包装材料在杨梅保鲜中的作用

纳米技术应用在杨梅保鲜包装上是一个新的尝试,它采用了交互性实验设计方案,将银纳米材料添加进塑料制成包装材料,可观测其保鲜效果.结果表明,纳米塑料包装材料和纳米奇冰石在提高杨梅好果率和延长货架期方面有正面效果;同时,在抑制VC分解方面具有一定的作用.     

温度对不同育成地水稻品种的生长及其物质生产的影响

以原产温带的日本晴三粳稻品种和原产热带的IR8两籼稻品种为材料,观察了16—30℃恒温对其生长和物质生产的影响。结果:在试验温度范围内,各个品种的植株均随温度升高而增高;但两类品种的株高感温指数有差异,IR8两品种的较低,日本晴三品种的较高。IR8两品种在30℃下分蘖数最大,日本晴三品种则是在25℃下,较有利于它们的分蘖。IR8两品种的CGR和NAR,以30℃下最大,日本晴三品种则以25℃下的最大,干物质生产量亦呈此趋势。所有供试品种都是在25℃下出叶最少,出叶间隔天数则以在20℃下为最快。     

“葫芦克星”对恶性杂草水葫芦的几个生理指标的影响

采用盆栽试验方法,研究了“葫芦克星”对水葫芦几个生理指标的影响,探讨“葫芦克星”控制恶性杂草水葫芦的机制。研究结果表明,喷施“葫芦克星”后,水葫芦叶片的过氧化物酶（POD）活性、多酚氧化酶（PPO）活性和丙二醛（MDA）含量与水葫芦的胁迫反应是相关的。喷药后,水葫芦叶片POD活性一直处于下降趋势且比清水对照POD活性低,而PPO活性和MDA含量则是先上升后下降且比清水对照高。     

Somatic cell and innate immune responses in mammary glands of lactating cows to intramammary infusion of Bifidobacterium breve at pre-drying off period

Intramammary infusion of Bifidobacterium breve (B. breve)-induced somatic cell (SC) counts, chemiluminescent response (CL), lactoferrin (LF) concentrations and mastitis-causing pathogens from quarters with subclinical mastitis were measured to evaluate innate immune response of mammary glands in dairy cows at 3 to 4 weeks before drying off. SC counts in 7 quarters of 7 control cows and 5 quarters of 6 cows with mastitis increased markedly on day 1 and SC values in control cows were significantly (P<0.05) increased and returned to pre-infusion levels on day 5 after B. breve-infusion. CL values in both groups increased markedly on day 1 and then decreased after B. breve-infusion; however, CL values in cows with mastitis did not return to normal levels on day 5 and at postpartum. The CL values were highly correlated with their SC counts in milk from both groups. LF concentrations increased toward day 3 after B. breve-infusion and were higher in cows with mastitis. B. breve-infusion eliminated 16.6% (1/6) of pathogens from 6 quarters with chronic subclinical mastitis. B. breve-induced SC responses in quarters from 3 cows with mastitis showed characteristic patterns of recovery, persistent and new infections. B. breve-induced SC counts in quarters from the cows in the pre-drying off were lower (25.7–70.6%) than those of the cows in mid-lactation. The intrinsic innate immune response in cows on pre-drying off may be decreased and appears to be insufficient to eliminate pathogens from mammary gland in the pre-drying off.